$('body').on("click", ".dropdown-menu", function (e) {
    $(this).parent().is(".show") && e.stopPropagation();
});

[Bootstrap 4 Alpha 6][Rails] 对于rails开发人员来说，e.s stoppropagation()将导致link_to的data-method不等于get的不良行为，因为它默认将所有请求返回为get。

为了解决这个问题，我建议这个解决方案，它是通用的

$('.dropdown .dropdown-menu').on('click.bs.dropdown', function() {
  return $('.dropdown').one('hide.bs.dropdown', function() {
    return false;
  });
});

$('.dropdown .dropdown-menu').on('click.bs.dropdown', function() { return $('.dropdown').one('hide.bs.dropdown', function() { return false; }); }); <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"> <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script> <ul class="nav navbar-nav"> <li class="dropdown mega-dropdown"> <a href="javascript:;" class="dropdown-toggle" data-toggle="dropdown"> <i class="fa fa-list-alt"></i> Menu item 1 <span class="fa fa-chevron-down pull-right"></span> </a> <ul class="dropdown-menu mega-dropdown-menu"> <li> <div id="carousel" class="carousel slide" data-ride="carousel"> <ol class="carousel-indicators"> <li data-slide-to="0" data-target="#carousel"></li> <li class="active" data-slide-to="1" data-target="#carousel"></li> </ol> <div class="carousel-inner"> <div class="item"> <img alt="" class="img-rounded" src="img1.jpg"> </div> <div class="item active"> <img alt="" class="img-rounded" src="img2.jpg"> </div> </div> <a data-slide="prev" role="button" href="#carousel" class="left carousel-control"> <span class="glyphicon glyphicon-chevron-left"></span> </a> <a data-slide="next" role="button" href="#carousel" class="right carousel-control"> <span class="glyphicon glyphicon-chevron-right"></span> </a> </div> </li> </ul> </li> </ul>

在Angular2 Bootstrap中，你可以在大多数情况下使用nonInput:

<div dropdown autoClose="nonInput">

nonInput -(默认值)当任意元素被单击时自动关闭下拉菜单-只要被单击的元素不是输入或文本区域。

https://valor-software.com/ng2-bootstrap/#/dropdowns

Bootstrap提供以下功能:

                 | This event is fired immediately when the hide instance method 
hide.bs.dropdown | has been called. The toggling anchor element is available as the 
                 | relatedTarget property of the event.

因此，实现这个函数应该能够禁止关闭下拉列表。

$('#myDropdown').on('hide.bs.dropdown', function (e) {
    var target = $(e.clickEvent.target);
    if(target.hasClass("keepopen") || target.parents(".keepopen").length){
        return false; // returning false should stop the dropdown from hiding.
    }else{
        return true;
    }
});

绝对最好的答案是在类下拉菜单之后放一个表单标签

所以你的代码是

<ul class="dropdown-menu">
  <form>
    <li>
      <div class="menu-item">bla bla bla</div>
    </li>
  </form>
</ul>

$(function() {
var closeble = false;
$('body').on('click', function (e) {
    if (!$(event.target).is("a.dropdown-toggle")) {
        closeble = false;
    }

});
$('.dropdown').on({
    "click": function(event) {
        if ($(event.target).closest('.dropdown-toggle').length) {
            closeble = true;
        } else {
            closeble = false;
        }
    },
    "hide.bs.dropdown": function() {
        return closeble;
    }
});

});